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This study demonstrates that directional atomic emission can be achieved in non-chiral systems solely through collective phase engineering and atomic motion, eliminating the need for geometric asymmetry. By reaching a directionality value of 0.89(1), the research provides a viable pathway for designing isotropic metamaterials and photonic structures with controlled interaction directions. The findings bridge fundamental quantum optics with practical applications in next-generation photonic device architecture.
Motion-induced directionality of collective emission in a non-chiral waveguide
arXiv:2603.03028v2 Announce Type: replace Abstract: We report the experimental observation of motion-induced directionality in collective atomic emission within a hollow-core waveguide, establishing a general principle: directional interactions can emerge from collective phase engineering alone. Remarkably, neither single-emitter asymmetry nor any asymmetry in the geometric arrangement of the system is required - both the atom-field coupling and the spontaneous emission are fully isotropic in our system. Instead, Raman-induced effective two-level emitters with spatially oscillating transition dipole phases and atomic motion give rise to controllable directionality, reaching values up to 0.89(1). We study the correlations of the superfluorescent bursts close to and well above the threshold to collective emission; we find thermal statistics below and a buildup of coherence above it. Numerical simulations based on the Truncated Wigner Approximation for spins yield good agreement. Additionally we present a simple model based on position uncertainty capable of reproducing the observed directionality. Our results open a new route to directional interactions in non-chiral systems, with direct implications for the design of directional metamaterials and photonic structures built from isotropic constituents.
Abstract:We report the experimental observation of motion-induced directionality in collective atomic emission within a hollow-core waveguide, establishing a general principle: directional interactions can emerge from collective phase engineering alone. Remarkably, neither single-emitter asymmetry nor any asymmetry in the geometric arrangement of the system is required - both the atom-field coupling and the spontaneous emission are fully isotropic in our system. Instead, Raman-induced effective two-level emitters with spatially oscillating transition dipole phases and atomic motion give rise to controllable directionality, reaching values up to 0.89(1). We study the correlations of the superfluorescent bursts close to and well above the threshold to collective emission; we find thermal statistics below and a buildup of coherence above it. Numerical simulations based on the Truncated Wigner Approximation for spins yield good agreement. Additionally we present a simple model based on position uncertainty capable of reproducing the observed directionality. Our results open a new route to directional interactions in non-chiral systems, with direct implications for the design of directional metamaterials and photonic structures built from isotropic constituents.
arXiv:2603.03028 [quant-ph]
(or arXiv:2603.03028v2 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2603.03028 Focus to learn more arXiv-issued DOI via DataCite
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Full text under the publisher's open licence · 260 words